Current-collecting device.



R. SIEGFRIED L H. G, JUNGK.

CURRENT COLLECTING DEVICE APPLICATION HLED OCT. I3. I91].

Patented Oct. 15, 1918-...

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ATTORNEY WITNESSES 2 (Dim 6 19w.

UNITED STATES PATENT OFFICE.

ROBERT SIEGFRIED AND HERBERT G. JUNGK, OF PITTSBURGH, PENNSYLVANIA, ASSIGNORS TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, A

CORPORATION OF PENNSYLVANIA.

CURRENT-COLLECTING DEVICE.

Application filed October 13, 1917.

To all whom it may concern:

Be it known that we, ROBERT SIEGFRLED, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, and HERBERT Gr. J UNGK, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Current-Collecting Devices, of which the following is a specification.

Our invention relates to current-collecting devices for dynamo-electric machines and particularly to the collector rings of alternating-current motors.

The object of our invention is to provide an improved means for mounting the collector rings upon a supporting member and for connecting the rings to the collector leads, whereby extreme temperature variations, during the operation of the machine, will not loosen the collector rings.

Another object of our invention is to provide novel means for retaining the insulating material between adjacent collector rings in position in spite of excessive vibrations to which the current-collecting device, as a whole, may be subjected during the operation of the machine.

In the accompanying drawing, Figure 1 is a longitudinal sectional view of substan tially one-half of a current-collecting device embodying our invention, and Fig. 2 is a transverse sectional view taken along the line II-JI of Fig. 1, parts being broken away. a

A plurality of collector rings 1 are arranged in spaced relation upon a supporting spider 2 that is provided with an external annular rim 3. The outer periphery of the rim 3 is provided with a plurality of longitudinally extending slots 4 within which are located collector leads 5 that are surrounded by sleeve 6 of the insulating material. Each slot 4 terminates in 'an enlarged, substantially rectangular portion 7 into which the ends of the leads 5 project. Contact pieces 8 are welded, or otherwise suitably secured in good electrical contact, to the ends of the lead 5 and projectbeyond the periphery of the rim 3. Each contact piece 8 is supported within the enlarged portion 7 of the slot 4 by blocks 9 of insulating material. A substantially cylin- Speciflcation of Letters Patent.

Patented Oct. 15, 1918.

Serial No. 196,396.

drical sleeve 10 of insulating material, pref erably composed of sheets of mica and treated paper, fits closely over the rim 3, and is provided with openings 11 for the reception of the projecting portions of the contact piece 8. The outer faces of the contact pieces 8 are slightly rounded to conform to the surface curvature of the sleeve 10 and are flush therewith.

Sets of banding wires 12 are wrapped closely around the sleeve 10, and are in close contact with the exposed portions of the contact pieces 8, at points where they extend through the sleeve 10. The collector rings 1 are mounted upon the several sets of band wires 12 and are maintained in close engagement therewith by means of retaining rings 13 that are located in annular grooves 14 with which the collector rings 1 are provided. The collector rings 1 and the retaining rings 13 are preferably formed of dissimilar metals, for a purpose that will be hereinafter described. U-shaped rings 15, preferably composed of compressed insulating material similar in composition to the material composing the sleeve 10, are located between adjacent collector rings 1 and are maintained in engagement with the sleeve 10 by means of rings 16 that are located in the annular spaces between the sides of the insulating rings 15. p

The assembly of our current-collecting de vice is as follows. The leads 5 are first placed in the slots 4, and the sleeve'lO is then placed around the rim 3, with the con tact pieces 8 located in the openings 11 in the sleeve 10. The banding wires 12 are then applied to the sleeve 10 to cover the exposed surfaces of the contact pieces 8. The wires 12 are then preferably turned down until they present a substantially continuous outer surface. The left-hand collector ring 1 is then applied to the first section of band wires 12, while heated, the normal inner diameter of the ring 1 being such that it will closely engage the band wires 12 as it cools and contracts. The retaining ring 13 is then applied to the groove 14, the outer diameter of the groove being great enough to receive the ring 13 while hot. After the ring 13 contracts, it closely grips the inner periphery of the groove 14. A ring 15 isthen applied to the sleeve 10,

et en the c lle tor ring 1 and the next ad.-

jacent strip of band wire 12, and the ring 16 i placed within the ring 15 while heated, so that, as its cools, it will compress the inner wall of the ring 15 and the sleeve 10 and maintain them in close engagement. The remaining collect-or rings 1 and the retaining rings 13 and insulating rings 15' are then applied in the order above described.

From'the foregoing, it is apparent that heating of the collector rings 1 during the operation of the machine will not tend to loosen them from the collector leads, because the retaining rings 13, having a smaller 00- efiicient of expansion, will tend to hold the collector rings 1 in closer engagement with the band wires 12, as the collector rings 1 tend to expand. Furthermore, the insulating rings 15 will remain in position, even under excessive vibrations, because the initial compression of the insulating material caused by the application of the rings 16 will be sufficient to maintain the rings 15 in close engagement with the sleeve 10.

hile we have shown our invention in a simple and preferred form, it is not so limited but is susceptible of various modifications within the scope of the appended claims.

e claim as our invention: 1. A current-collecting device for dynamo-electric machines comprising a supporting member, a collector ring mounted thereon and a retaining ring for said collector ring having a smaller coefiicient of expansion than said collector ring.

:2. A current-collecting device for dynamo-electric machines comprising a sup- )ortin member a collector rin mounted thereon and provided with a recess and a retaining ring located in said recess.

3. A current-collecting device for dynamo-electric machines comprising a supporting member, a collector ring mounted thereon and provided with an annular groove and a retaining ring shrunk into said groove.

4. A cu'rrentcollecting device for dynamo-electric machines comprising a supporting member, a collectorring mounted thereon and provided with an annular groove and' a retaining ring. shrunk into said groove, said retaining ring having a smaller coefficient of expansion than said collector ring.

In a current-collecting device for dynamo-electric machines, the combination with a supporting member, a collector lead carried thereby and a collector ring surrounding said supporting member, ofa retaining ring for maintaining said collector ring in engagement with said lead.

6. In a current-collecting device for dynamo-electric machines, the combination with supporting member, a collector lead carried thereby and a collector ring surrounding said supporting member, of a retaining ring shrunk on said collector ring for maintaining said collector ring in engagement with said lead.

7. In acurrent-colleeting device for dynamo-electric machines, the combination with a supporting member, a collector lead *arried thereby and a collector ring surrounding said supporting member, of a re taining ring shrunk on said collector ring for maintaining said collector ring in engagement with said lead, the said retaining ring having a smaller coefiicient ot' expansion than said collector ring.

8. In a current-collecting device for dyi'iamo-eleotric machines, the combination with asupporting member, a collector lead carried thereby and a collector ring surrounding said supporting member, and pr vided with an annular groove, of a retaining ringlocated in said groove for maintaining said collector ring in engagement with said lead.

9. In a current-collecting device for dynamo-electric machines, the combination with a supporting member, and a collector lead carried thereby, of concentric rings of dissimilar metal surrounding said supporting member, the inner ring being in engagement with said lead and having a greater coeflicientof expansion than the other of said rings.

10. In a current-collecting device for dynamo-electric machines, the combination with a supporting member, and a collector lead carried thereby, of rings of dissimilar metal shrunk on said supporting member, the said rings having engaging peripheral portions and one of said rings being in engagement with said lead.

11. In a current-collecting device for dynamo-electric machines, the combination with an annular supporting member, and longitudinally extending collector leads arranged around a periphery of said member of a pluralityof collector rings surrounding said member and in engagement at intervals with said leads, each ring being in engagement with a difi'erent lead.

12. In a 'cur'rent-c'ollecting device for dynamo-electric machines, the combination with an annular supporting member, and longitudinally extending collector leads arra-nged'around a periphery of said member, of a plurality of collector leads arranged in spaced relation along said member, and plurality of retaining rings shrunk on said collector rings for maintaining each of said collector rings in engagement with a different lead.

13. In a current-collectin device for dy namo-electric machines, tie combination with an annular supporting member, and longitudinallyextending collector leads arranged around a periphery of said member,

of a plurality of collector leads arranged in spaced relation along said member, and a plurality of retaining rings shrunk on said collector rings for maintaining each of said collector rings in engagement with a different lead, and a plurality of rings of insulating material disposed between adjacent collector rings and maintained in engagement with said leads by shrunk-on metallic rings.

14. In a current-collecting device for dynamo-electric machines, the combination with an annular supporting member, and longitudinally extending collector leads arranged around a periphery of said member, and a layer of insulatlng material surrounding said leads except at intervals where said leads project through said layer, of a plurality of collector rings surrounding said layer and in engagement with said leads at those points where said leads project through said layer.

15. In a current-collecting device for dynamo-electric machines, the combination with an annular supporting member, and longitudinally extending collector leads arranged around a periphery of said member, and a layer of insulating material surrounding said leads except at intervals where said leads project through said layer, of a plurality of collector rings surrounding said layer and in engagement with said leads at those points Where said leads project through said layer, and a plurality of shrunkon retaining rings for maintaining said collector rings in engagement with said leads at those points where said leads project through said layer.

16. In a current-collecting device for dynamo-electric machines, the combination with an annular supporting member, and longitudinally extending collector leads arranged around a periphery of said member, and a layer of insulating material surrounding said leads except at intervals where said leads project through said layer, of a plurality of collector rings surrounding said layer and in engagement with said leads at those points where said leads project through said layer, and a plurality of shrunk-on retaining rings for maintaining said collector rings in engagement with said leads at those points where said leads project through said layer, and a plurality of rings of insulating material disposed between adjacent collector rings and maintained in engagement with said insulating layer by shrunk-on metallic rings.

In testimony whereof, we have hereunto subgcribed our names this 22nd day of Sept, 191

ROBERT SIEGFRIED. HERBERT Gr. JUNGK.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of latents, Washington, D. C. 

